Fushiman P260-DHC Pressure Reducing Valves

Manufacturer: Fushiman Co.,LTD.
Model: P260-DHC

Model	Nominal Diameter (mm)	Primary Side Pressure	Secondary Side Set Range	Maximum Operating Temperature	Body Material	Connection
P260-DHC	15〜250	MAX. 1.0MPa	0.03～0.9MPa	220℃	FC,FCD,SCPH	Flange

The DHC-type pressure reducing valve is designed for steam pressure reduction in energy plants and receiving equipment, featuring a secondary pressure balance structure.

Even if the primary side pressure fluctuates, the presence of a check valve or control valve and a high or low flow meter on the primary side of the pressure reducing valve ensures stable pressure control.
It is also suitable for use as a second-stage pressure reducing valve in two-stage pressure reduction systems, where the pressure reducing valve is used in series.

Specifications and Performance

Nominal Diameter			15–250 mm
Fluid			Steam
Primary Side (Steam)		Pressure	0.1–1.0 MPa
Primary Side (Steam)		Maximum Temperature	220°C
Secondary Side Set Pressure Range			0.03–0.2 MPa, 0.1–0.8 MPa, 0.5–0.9 MPa
Cv Value			4.5d²–3.1d²
Maximum Pressure Reduction Ratio			20:1
Minimum Differential Pressure Setting			10% of primary side pressure (minimum 0.07 MPa)
Offset			0.03 MPa or less
Shutoff Pressure Rise			0.02 MPa or less
Minimum Adjustable Flow Rate			5% of rated flow
Valve Seat Leakage			0.05% or less of rated flow
Main Component Materials	Valve Body		Cast iron (1) or cast steel
	Main Valve & Valve Seat		Stainless steel
	Piston & Cylinder		Stainless steel
	Diaphragm		Stainless steel
	Balance Piston		Stainless steel
Pipe Connection			JIS10K full-face seating

Note (1): The valve body for nominal diameters 15 to 40 is made of spheroidal graphite cast iron (ductile iron).

Structure

Notes:

For dimensions and weight.
For nominal diameter selection.

DHC (District Heating and Cooling) System – Example of P260-DHC Pressure Reducing Valve Piping

Parent-Child Valve System
Since the primary-side pressure of the pressure reducing valve will not stabilize when restricted by check valves or flow meters, use a parent-child valve system that arranges large (大) and small (小) pressure reducing valves in parallel.
- The nominal diameter of the small (小) pressure reducing valve should be selected so that it can handle a flow rate greater than the maximum flow of the small flow meter.
- The setting pressure of the large (大) pressure reducing valve should be set 0.03 MPa lower than that of the small (小) pressure reducing valve.
Piping Volume on the Primary Side of the Pressure Reducing Valve
- As much as possible, increase the primary-side piping volume by using a pipe one size larger than the pressure reducing valve, ensuring a length equivalent to 6 meters.
- If a check valve or flow meter is installed upstream, ensure that there is adequate piping volume from the small (小) flow meter.